P. Kanekar et al., WOLFFIA-ARRHIZA (L) WIMMER AND SPIRODELLA-POLYRRHIZA (L) SCHLEIDEN ASTEST PLANT-SYSTEMS FOR TOXICITY ASSAY OF MICROBIALLY TREATED DYESTUFFWASTE-WATER, Journal of environmental biology, 14(2), 1993, pp. 129-135
Two aquatic plant species, Wolffia arrhiza (L.) Wimmer and Spirodella
polyrrhiza (L.) Schleiden were tested for toxicity of the dyestuff was
te water containing phenol and methyl violet as the major pollutants.
Both the species showed no survival in 1 : 0 (original) and 3 : 1 dilu
tions of untreated and treated waste waters indicating toxicity of the
dyestuff waste. The plants showed 100% survival in 1 : 3 dilution of
microbially treated waste thus indicating reduction in toxicity of the
waste after microbial treatment. This was further substantiated by th
e growth pattern of the two species which are suggested as test system
s for toxicity assay of dyestuff waste water.